EP1240728A1 - Procede et appareil permettant de commander la puissance d'emission dans un systeme de radiocommunication - Google Patents

Procede et appareil permettant de commander la puissance d'emission dans un systeme de radiocommunication

Info

Publication number
EP1240728A1
EP1240728A1 EP00985575A EP00985575A EP1240728A1 EP 1240728 A1 EP1240728 A1 EP 1240728A1 EP 00985575 A EP00985575 A EP 00985575A EP 00985575 A EP00985575 A EP 00985575A EP 1240728 A1 EP1240728 A1 EP 1240728A1
Authority
EP
European Patent Office
Prior art keywords
power
size
rate matching
signal
transmission power
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP00985575A
Other languages
German (de)
English (en)
Inventor
David Setty
Volker Sommer
Stefan Oestreich
Gerald Lehmann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nokia Solutions and Networks GmbH and Co KG
Original Assignee
Roke Manor Research Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from GBGB9929577.6A external-priority patent/GB9929577D0/en
Application filed by Roke Manor Research Ltd filed Critical Roke Manor Research Ltd
Publication of EP1240728A1 publication Critical patent/EP1240728A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/26—TPC being performed according to specific parameters using transmission rate or quality of service QoS [Quality of Service]
    • H04W52/267—TPC being performed according to specific parameters using transmission rate or quality of service QoS [Quality of Service] taking into account the information rate
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0009—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding
    • H04L1/0013—Rate matching, e.g. puncturing or repetition of code symbols
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0056—Systems characterized by the type of code used
    • H04L1/0067—Rate matching
    • H04L1/0068—Rate matching by puncturing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/08—Arrangements for detecting or preventing errors in the information received by repeating transmission, e.g. Verdan system

Definitions

  • the present invention relates to a method and apparatus for controlling the transmission power in a telecommunications system. More specifically, the present invention relates to a method and apparatus for controlling the transmission power in a Time Division Duplex (TDD) wireless telecommunication system based on a relationship between the size of the Midamble and the size of the data in a transmission burst.
  • TDD Time Division Duplex
  • RM frequency division duplex
  • the overall power requirements of the wireless telecommunication system and the system's costs are reduced.
  • a method for controlling the transmission power in a time division duplex wireless telecommunication system comprising the step of adjusting the transmission power of the system according to a relationship between the size of the
  • said relationship between the size of the Midamble signal (M ) and the size of data signal (D) within said transmission burst is a slope (S).
  • the method comprises the further steps of determining change in rate matching ( ⁇ RM) used within said wireless telecommunication system, determining a minimum transmission power level required to maintain a predetermined ratio of carrier signal power to interference signal power, and adjusting said transmission power according to said slope and said change in rate matching.
  • said predetermined ratio of carrier signal power to interference signal power includes a guard level.
  • apparatus for controlling the transmission power in a time division duplex wireless telecommunication system comprising the step of: adjusting the transmission power of the system according to a relationship between the size of a Midamble signal and the size of a data signal with a transmission burst.
  • Figure 2 is an example of a burst structure
  • Figure 3 is a graph which shows the relationship of transmission power to rate matching in a TDD system.
  • FIG. 4 shows a partial handset architecture in accordance with the invention.
  • FIG. 5 shows a partial base station architecture in accordance with the invention.
  • FIG. 2 shows the structure of a typical burst signal 10.
  • the burst signal consists of two data parts 12 and 14, a Midamble part 16, and a guard period 18.
  • Each data part consists of 976 bits and the Midamble consists of 512 bits.
  • the guard period consists of N bits, where N is an integer number.
  • N is an integer number.
  • the sizes of the data parts, Midamble and guard period may vary according to the wireless telecommunication system's particular requirements. It will also be appreciated that the structure may not contain a guard period.
  • the T x power of a mobile phone is changed based on the following factors: a puncturing limit value, a minimum carrier signal power to interference signal power ratio, and the amount of data in the burst.
  • the minimum carrier signal power to interference signal power ratio may include a guard level.
  • a maximum T x power is set according to a puncturing limit (PL).
  • the value of PL is set at the maximum amount of puncturing which a signal can withstand. Any puncturing beyond this value results in a signal which has lost too much data to be successfully interpreted.
  • the PL is determined by the rate matching parameters of the telecommunication system and is transmitted from the base station to user equipment, such as a mobile phone.
  • a minimum T power is set according to a minimum value of the ratio of carrier signal power to interference signal power (C/I min) in which the system can still function properly.
  • the value of C/I min may be predefined based on knowledge of the system or it may be transmitted by the base station a* and be derived from previous values of C/I min, or befestimation. This ratio may include a guard level which functions to insure that the minimum T x power level is never reached.
  • the amount of data in the burst is then compared to the amount of
  • the amount in which the T x power can be reduced or increased is then calculated.
  • the maximum amount the T power can be increased by is preferably set at the PL value. Increasingly the T x power beyond the PL value will not improve the system's performance as the amount of data lost due to the puncturing process determines the point of system failure.
  • the minimum level to which the T x power can be reduced is preferably set at the C/I min value previously discussed.
  • the C/I min value may include a guard level.
  • the maximum and minimum T x power levels may tend towards an asymptote at these values. For the region between the maximum and minimum T x power levels, the value of the T x power is calculated according to a relationship between the size of the data and the size of the Midamble in each burst.
  • Figure 3 shows a graph of the specific example of the present invention with the X axis representing the value of the rate matching(RM) and the Y axis representing the change in the value of the ratio of the carrier signal power to interference signal power ( ⁇ C/I).
  • ⁇ C/I the ratio of the carrier signal power to interference signal power
  • the value of ⁇ C/I min is predetermined and transmitted by the base station.
  • the PL value is predetermined and may also be transmitted by the base station.
  • the maximum and minimum T x power levels are depicted on the graph in figure 3 by the solid lines 31 and
  • a guard level 40 is included. This has the effect of increasing the minimum level to which the T x power can be reduced.
  • the rate of change of T x power is determined according to the amount of data in the burst (D) and the size of the Midamble (M).
  • the rate of change is constant and is shown graphically in figure 3 by slope S.
  • the slope is calculated according to equation 1 :
  • the amount the T x power is increased or decreased can then be calculated according to the following set of rules.
  • the change in T power is shown graphically in figure 3 as ⁇ C/I and is calculated in decibels (dB).
  • the initial value of the rate matching (RM 0 ) is equal to 1. This corresponds to an initial ⁇ C/I ( ⁇ C/I 0 ) value of 1.
  • the point of intersection of RM 0 and ⁇ C/I 0 is shown in figure 3 by reference numeral 35.
  • the new value of rate matching is denoted as RM N .
  • the rate matching at that point is denoted by RM ma
  • the rate matching (RM) is constantly being changed according to the system ' s requirements.
  • the change in rate matching ( ⁇ RM) is measured in decibels and is calculated according to equation 2.
  • the rate matching uses puncturing the T x power level will be increased according to the slope in the portion of the graph between RM 0 and PL. Similarly, when the rate matching uses repetition the T power level will be reduced according to the slope in the portion of the graph between RM G and RM max .
  • FIG. 4 shows the relevant features of a handset architecture 40 in accordance with a first embodiment of the invention.
  • RF signals are coupled by an antenna 42, which is connected via a duplexer 44 to transmit and receive circuitry 46, 48.
  • the power level of received signals is measured by power level detector 52 after the signals have been filtered and demodulated by filter/demodulator 50.
  • the power level detector provides data to a microprocessor 54 which compensates for rate matching and provides data to power control 56 which, in turn, provides power control data bits.
  • the power control bits are combined with encoded signals prior to modulation and subsequent transmission via the antenna.
  • Figure 5 shows how the invention can be implemented in a base station 70.
  • the amplifier control circuit comprises a power control unit 76, as are typically employed in prior art base stations and a spreading and matching compensation circuit 78.
  • the rate matching and spreading compensation then offsets the power control.
  • the burst then g too- es through the ordinary transmission and modulation circuits.
  • the signals are then modulated by modulator 80 prior to transmission via antenna 82.
  • the modulator would typically contain signal filters.
  • the T x power requirement changes linearly with respect to a change in the spreading factor. For example, if the spreading factor doubles, the T x power requirement is halved.
  • Midamble size can be used to calculate the T x power adjustment due to the spreading factor in a TDD system.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Quality & Reliability (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Transmitters (AREA)
  • Time-Division Multiplex Systems (AREA)

Abstract

La présente invention concerne un procédé permettant de commander les besoins en puissance d'émission dans un système de radiocommunications duplex à répartition dans le temps. Ce procédé utilise la taille des données et un mi-ambule dans une rafale et la modification de l'adaptation du débit binaire pour commander la puissance d'émission.
EP00985575A 1999-12-15 2000-12-15 Procede et appareil permettant de commander la puissance d'emission dans un systeme de radiocommunication Withdrawn EP1240728A1 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
GB9929577 1999-12-15
GBGB9929577.6A GB9929577D0 (en) 1999-12-15 1999-12-15 Method of power adaptation due to rate matching for mobile telecommunications systems
GB0024105 2000-10-03
GBGB0024105.9A GB0024105D0 (en) 1999-12-15 2000-10-03 Method for controlling the transmission power in mobile phones
PCT/GB2000/004819 WO2001045297A1 (fr) 1999-12-15 2000-12-15 Procede et appareil permettant de commander la puissance d'emission dans un systeme de radiocommunication

Publications (1)

Publication Number Publication Date
EP1240728A1 true EP1240728A1 (fr) 2002-09-18

Family

ID=26245089

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00985575A Withdrawn EP1240728A1 (fr) 1999-12-15 2000-12-15 Procede et appareil permettant de commander la puissance d'emission dans un systeme de radiocommunication

Country Status (5)

Country Link
US (1) US20030103469A1 (fr)
EP (1) EP1240728A1 (fr)
JP (1) JP3960373B2 (fr)
CN (1) CN1203626C (fr)
WO (1) WO2001045297A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU2003237038A1 (en) * 2002-06-28 2004-01-19 Koninklijke Philips Electronics N.V. Adaptive rate matching method
US20050063314A1 (en) * 2003-09-19 2005-03-24 Zafer Sahinoglu Method and system for content aware and energy efficient transmission of videos and images
JP4769657B2 (ja) * 2006-07-28 2011-09-07 京セラ株式会社 無線通信方法及び無線通信端末
JP4829049B2 (ja) * 2006-08-30 2011-11-30 京セラ株式会社 無線通信方法及び無線基地局
JP5647085B2 (ja) * 2011-09-21 2014-12-24 日本電信電話株式会社 送信方法及び送信装置

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5822318A (en) * 1994-07-29 1998-10-13 Qualcomm Incorporated Method and apparatus for controlling power in a variable rate communication system
US5621723A (en) * 1994-09-27 1997-04-15 Gte Laboratories Incorporated Power control in a CDMA network
FI104527B (fi) * 1997-09-17 2000-02-15 Nokia Mobile Phones Ltd Mukautuva radiolinkki
EP1023790A1 (fr) * 1997-10-16 2000-08-02 Siemens Aktiengesellschaft Procede et station radio pour transmettre des donnees
US6775260B1 (en) * 1999-02-25 2004-08-10 Texas Instruments Incorporated Space time transmit diversity for TDD/WCDMA systems
US6917597B1 (en) * 1999-07-30 2005-07-12 Texas Instruments Incorporated System and method of communication using transmit antenna diversity based upon uplink measurement for the TDD mode of WCDMA
US6597723B1 (en) * 2000-03-21 2003-07-22 Interdigital Technology Corporation Weighted open loop power control in a time division duplex communication system

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0145297A1 *

Also Published As

Publication number Publication date
US20030103469A1 (en) 2003-06-05
WO2001045297A1 (fr) 2001-06-21
CN1203626C (zh) 2005-05-25
CN1433598A (zh) 2003-07-30
JP2003517250A (ja) 2003-05-20
JP3960373B2 (ja) 2007-08-15

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